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Ansc 630: Reproductive Biology 1

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Ansc 630: Reproductive Biology 1 ANSC 630: REPRODUCTIVE BIOLOGY 1 INSTRUCTOR: FULLER W. BAZER, PH.D. OFFICE: 442D KLEBERG CENTER EMAIL: [email protected] OFFICE PHONE: 979-862-2659 ANSC 630: INFORMATION CARD • NAME • MAJOR • ADVISOR • RESEARCH INTERESTS • PREVIOUS COURSES: – Reproductive Biology – Biochemistry – Physiology – Histology – Embryology OVERVIEW OF FUNCTIONAL REPRODUCTIVE ANATOMY: THE MAJOR COMPONENTS PARS NERVOSA PARS DISTALIS Hypothalamic Neurons Hypothalamic Neurons Melanocyte Supraoptic Stimulating Hormone Releasing Paraventricular Factor Axons Nerve Tracts POSTERIOR PITUITARY INTERMEDIATE LOBE OF (PARS NERVOSA) Oxytocin - Neurophysin PITUITARY Vasopressin-Neurophysin Melanocyte Stimulating Hormone (MSH) Hypothalamic Divisions Yen 2004; Reprod Endocrinol 3-73 Hormone Profile of the Estrous Cycle in the Ewe 100 30 30 50 15 15 GnRH (pg/ml)GnRH GnRH (pg/ml)GnRH 0 0 (pg/ml)GnRH 0 4 h 4 h 4 h PGF2α Concentration 0 5 10 16 0 Days LH FSH Estradiol Progesterone Development of the Hypophysis Dubois 1993 Reprod Mamm Man 17-50 Neurons • Cell body (soma; perikaryon) – Synthesis of neuropeptides • Cellular processes • Dendrites • Axon - Transport • Terminals – Storage and Secretion Yen 2004 Reprod Endocrinol 3-73 • Peptide neurotransmitter synthesis • Transcription – Gene transcribes mRNA • Translation – mRNA translated for protein synthesis • Maturation – post-translational processing • Storage in vesicles - Hormone secreted from vesicles Hypothalamus • Mid-central base of brain – Optic chiasma – 3rd ventricle – Mammillary body • Nuclei – Clusters of neurons • Different functions & stimuli for hormone secretion – Secrete peptide hormones • Control pituitary activity • Vascular connections • Neural connections • Vascular connection to Anterior Pituitary – Hypothalamo-hypophyseal portal system • Axons to capillaries in pituitary stalk where GnRH and Dopamine is released • Blood to AP – Superior Hypophyseal Artery (SHA) – Primary Portal Plexus (PPP) – Secondary Portal Plexus (SPP) – GnRH – releases LH and FSH – Dopamine – Prolactin Inhibiting Factor Hypothalamohypophyseal Portal Vasculature • Hypophysiotropic peptidergic or aminergic neurons terminate adjacent to the primary capillaries of the infundibulum (3, 5) or adjacent to the capillaries of the short portal vessels (2) • Neurohypophyseal neurons project to the neurohypophysis and secrete neurohormones into the sinusoids of the neurohypophysis Hypothalamohypophyseal Portal Vasculature • Blood supply – Internal carotid artery • Superior hypophyseal artery (rostral) • Inferior hypophyseal artery (caudal) – infundibulum and neurophypophysis • Anterior hypophyseal artery (trabecular artery; mediorostral) Hypothalamic Regulation of Anterior Pituitary Hormones • Gonadotropin Releasing Hormone – GnRH • Corticotrophin Releasing Hormone – CRH • Thyrotrophin Releasing Hormone – TRH • Growth Hormone Releasing Hormone – GHRH • Growth Hormone Inhibiting Factor- Sommatostatin • Prolactin Inhibiting Factor – Dopamine • Prolactin Stimulating Factors - oxytocin, Preoptic Area and Hypothalamus INPUTS Light:Dark Ratio Smell Nutritional Status HYPOTHALAMUS Sight Stress Neurotransmitters Neurotransmitters/Neurohormones • Amino acid derivatives • Cathecholamines: dopamine, norepinephrine, epinephrine • Derived from phenylalanine and tyrosine Lovejoy 2005; Neuroendocrinology 119-148 Hypothalamus GnRH, PIF,GHRH, CRH, TRH Hyphothalamo-Hypophyseal Portal System ANTERIOR PITUITARY GLAND GONADOTROPHS Follicle Stimulating Hormone (FSH) Luteinizing Hormone (LH) LACTOTROPHS Prolactin (PRL) SOMATOTROPHS Growth Hormone (GH) THYROTROPHS Thyroid Stimulating Hormone (TSH) CORTICOTROPHS Adrenocorticotrophin Stimulating Hormone (ACTH) Pituitary • Anterior Lobe • Posterior Lobe • Adenohypophysis • Neurohypophysis • Pars distalis • Pars nervosa – Endoectoderm origin – Neuroectoderm origin – Produces – Stores and releases • FSH • Vassopressin • LH • Oxytocin • PRL • GH • Intermediate Lobe • ACTH • Pars intermedia • TSH – Neuroectoderm origin Hypothalamic Neurons Hypothalamic Neurons Melanocyte Supraoptic Stimulating Hormone Releasing Paraventricular Factor Axons Nerve Tracts POSTERIOR PITUITARY INTERMEDIATE LOBE OF (PARS NERVOSA) Oxytocin - Neurophysin PITUITARY Vasopressin-Neurophysin Melanocyte Stimulating Hormone (MSH) • Neural Supply to PP – Supraoptic nucleus • Vassopressin-Neurophysin I – Paraventricular nucleus • Oxytocin-Neurophysin I – Neurophysins Chaperone peptide forms complex with oxytocin and neurophysin Hormone-Neurophysin Complex Transported via axons to Nerve Terminals in the Posterior Pituitary Gland – Neural stalk Axons release Oxytocin + Neurophysin I or Vasopressin + Neurophysin I into capillaries draining Posterior Pituitary Neuro-Endocrine Reflex Pineal Gland (epiphysis) • Photoreceptor in amphibians • Endocrine gland in mammals – Influenced by light and season – Secretes melatonin • Melatonin Influences GnRH secretion – Long-day breeders - Horse – Short -day breeders - Sheep Female Reproductive Anatomy • Ovaries • Oviducts • Uterus • Cervix • Vagina • Vestibule • Vulva • Clitoris Female Reproductive Anatomy • Ovaries • Oviducts • Uterus • Cervix • Vagina • Vestibule • Vulva • Clitoris Ovarian Architecture • Cortex –outer zone – Covered by germinal epithelium • Medulla – inner zone – Loose connective tissue – Stroma continuous with stroma of mesovarium at hilus most species equine Follicular Fluid Theca cells Zona Pellucida Oocyte With Nucleus Corona Radiata Cumulus Oopherus (cumulus granulosa cells) Mural Granulosa Cells Basement Membrane GDF, growth differentiation factor 9 BMP, bone morphogenic protein AA – amino acid SCF, stem cell factor LH-R, LHCGR, luteinizing hormone receptor OVARY • Functions – Gametogenesis – ovum, ova – Steroidogenesis – estrogen, progesterone • Round, almond- or bean-shaped – Depends on species • Paired – Most species, completely surrounded by a thin membrane, the infundibulum, which is a part of the oviduct. • Suspended – caudal to kidneys in sublumbar region by the mesovarium (part of the broad ligament supporting the entire reproductive system) Ovarian Histology • Germinal epithelium – simple squamous or low cuboidal • covers free surface of ovary • basement membrane absent • Tunica albuginea – dense layer of connective tissue beneath the germinal epithelium Ovarian Histology • Primordial follicles – immediately beneath the tunica albuginea – lacks a membrane – separated from adjacent interstitial tissue by a single layer of follicular (granulosa) cells • Primary follicles – lifetime supply at birth – remain at this stage until puberty – most never ovulate,but undergo atresia Ovarian Histology • Secondary follicles – growing follicles – increase in number of layers of granulosa cells – Zona pellucida • Tertiary follicles – maturing follicles – antrum formation • fluid filled space – oocyte on mound of granulosa • Cumulus oophorus – granulosa layer immediately around oocyte • Corona radiata – Granulosa surrounded by • Theca interna • Theca externa MATURE GRAAFIAN FOLLICLE Follicular Fluid Theca cells Zona Pellucida Oocyte With Nucleus Corona Radiata Cumulus Oopherus (cumulus granulosa cells) Mural Granulosa Cells Basement Membrane Ovarian Histology • Mature Graafian Follicle – Same structures as tertiary follicle, but larger • Layers of cells & volume of follicular fluid is greater • Stigma-like structure forms on surface of follicle to ovulate • Size of Ovulatory Follicle – Cow • 15-20 mm – Mare • 25-70 mm – Bitch, ewe, doe, sow • 5-10 mm Ovarian Histology • Corpus hemorrhagicum (CH)/Corpora hemorrhagica – newly ruptured follicle – essentially a blood clot • Corpus luteum (CL)/Corpora lutea – LH stimulates formation from theca interna and granulosa – temporary endocrine gland • progesterone • Corpus albicans (CA)/Corpora albicantia – remains after CL regresses CORPUS LUTEUM MATURE GRAAFIAN FOLLICLE Follicular Fluid Theca cells Zona Pellucida Oocyte With Nucleus Corona Radiata Cumulus Oopherus (cumulus granulosa cells) Mural Granulosa Cells Basement Membrane Ovulatory Surge of Luteinizing Hormone Primates Structural Changes During Luteinization TC LC A BV O GC Two Cell Theory for Ovarian Sex Steroid Production • THECA CELLS: Cholesterol to Progestins (Pregnenolone and Progesterone and 17-alpha hydroxy progestins) to androgens (testosterone and dehydroepiandrosterone) • GRANULOSA CELLS: Androgens to Estrogens VIA AROMATASE ENZYME • LUTEAL CELLS – Cholesterol to Progesterone Steroidogenesis Before LH Surge FSH A GL Ch P A2 P450scc Arom E2 3b-HSD BM TI Ch P450scc P A2 E2 17a-HSD 3b-HSD TE LH A: Antrum; GL: Granulosas; BM; Basement Memb TI: Theca Int. TE: T Ext.; C: Capillaries Ch: Cholesterol; P: Progesterone; A2: Endrogen; E2: Estradiol Luteal Steroidogenesis Large Luteal Cells (Some Species) Ch A E P450scc P17 a-HSD 2 Arom 2 3b-HSD Ch A E P450scc P17 a-HSD 2 Arom 2 3b-HSD Small Luteal Cells Ch: Cholesterol; P: Progesterone; A2: Endrogen; E2: Estradiol Endocrine Effects of Progesterone Inhibits LH and FSH Secretion Lobuloalveolar Contraction Development and Secretion PROGESTERONE - the HORMONE of PREGNANCY! Differentiation and Secretion Duration of Luteal Function Across Species Weeks Weeks Days/Weeks Weeks Months Physiological Review 79:263 Tubular Female Reproductive Tract • Oviducts, uterus, cervix, vagina & vestibule • Common basic structure – Four concentric layers • Serosa • Muscularis • Submucosa • Mucosa Female Reproductive Tract • Suspended in abdominal cavity by a fold of peritoneal lining – Broad Ligament: supports vessels, lymphatics & nerves to each part of tract •
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